parasitic infection

Question 1

This defines what?
An organism that lives on or in a host organism and gets its
food from or at the expense of its host.

Answer 1

Parasites

Question 2

What are the three main classes of human parasites?

Answer 2

protozoa, helminths, and ectoparasites

Question 3

Some parasitic diseases in the US that are public health
priority include..

Answer 3

chagas disease,
cyclosporiasis,
cysticerosis,
toxocariasis,
toxoplasmosis,
trichomoniasis

Question 4

Parasitic infections are reportable?

Answer 4

yes

Question 5

True/false
Parasites are transmitted through consumption of contaminated food or water, bite of an infected arthropod, certain practices, fecaloral-
route, person-to-person, and between animals and people.

Answer 5

true

Question 6

What type of parasite
One-celled organisms that are free-living or harbors on a host.

Answer 6

Protozoa

Question 7

Protozoa that harbor in human GI track are transmitted via….

Answer 7

Fecal oral route or person-to-person contact

Question 8

Protozoa in the blood or tissue are transmitted to another human by

Answer 8

the bite of an infected arthropod vector.

Question 9

Protozoa are classified further into groups based on what?

Answer 9

mode of movement

Question 10

Protozoa groups
1) ________ – The ameba (eg. Entamoeba)
2) ________ – The flagellates (eg. Giardia, Leishmania)
3) ________– The cilates (eg. Balantidium; the only cilates
protozoan to affect humans)
4) ________ – Non motile adult stage organisms (eg.
Plasmodium, Cryptosporidium).

Answer 10

1) Sarcodina
2) Mastigophora
3) Ciliophora
4) Sporozoa

Question 11

What is the leading cause of waterborne disease in the US

Answer 11

Cryptosporidium

Question 12

Parasite type:
Large multicellular organisms visible to the naked eye in adult stage, that are free-living or harbors on a host

Answer 12

Helminths

Question 13

True/False
Helminth parasites invade the GI track, and are able to multiply in humans.

Answer 13

False
unable to multiply in humans

Question 14

The three main groups of soil-transmitted helminths human parasite infection
1) _____________ – Reside in the GI tract. eg. Blood flukes (known as trematodes; eg. shisthosomiasis), and tapeworms (cestodes).
2) ______________ – Reside in the GI tract.
3) ______________ – Reside in the GI tract, blood, lymph system or subcutaneous tissues (ie. ascarids, hookworms, pinworms).

Answer 14

1) Flatworms (platyhelminths)
2) Thorny-headed worms (acanthocephalins)
3) Roundworms (nematodes)

Question 15

What parasite type
Ticks, fleas, lice, and mites that burrow into the skin and remain there for weeks to months. This category broadly including other blood-sucking arthropods such as mosquitos.

Answer 15

Ectoparasites

Question 16

Parasitic Infection – Lab Diagnosis
-Ordered to find protozoan or helminths parasite in patients
presenting with GI symptoms indicative of parasitic infection.

Answer 16

Fecal (stool) exam

Question 17

Fecal (stool) exam
Collect _____ or more stool samples on separate days.

Answer 17

three

Question 18

Parasitic Infection – Lab Diagnosis
Used when stool exam findings are unremarkable, but patient continue to have symptoms indicative of GI parasitic infection.

Answer 18

Endoscopy/Colonoscopy

Question 19

Parasitic Infection – Lab Diagnosis
-Blood tests
(a) ______ looks for antibodies or parasite antigens produce by the body’s immune response to a parasitic disease.
(b) ________ identifies parasitic species in the blood under a microscope (eg. Malaria).

Answer 19

(a) Serology
(b) Blood smear